If gravitation suddenly stops?!

If gravitation suddenly stops …… neglecting the rotation … if someone is standing on ground ….. will the normal reaction disappear?? If yes why? I want to know when does normal reaction acts on a body? and in the absence of weight why would it disappear? (Ahwan Abhinandan Joshi asks)

Kinetic Energy – Numerical Problem

a running man has half the kinetic energy that a boy of half his mass has.the man speed up by 1m/s and then has the same kinetic energy as the body. what were the original speeds of man and boy?

What is Eddy Current?

Eddy currents are circulating currents induced in the body of a solid conductor whenever the magnetic flux linked with it changes. It is called EDDY CURRENT because they are like eddies formed in water. http://youtu.be/zJ23gmS3KHY Also read http://askphysics.com/ask-physics/eddy-currents-applications/

Class XI CBSE – Revision Questions MCQ – Semester 1

What is the gravitational field strength of a planet when the weight of a 100 kg astronaut is 400 N? a)      ¼ N kg-1   b) 9.8 N kg-1 c) 4 N kg-1  d) infinity   The only natural satellite of the earth complete orbits in about a)      24 days b) 27.3 days c) 30 days … Continue reading Class XI CBSE – Revision Questions MCQ – Semester 1

Horizontal projectile and freely falling body

A rifle at a height H aimed horizontally fires a bullet to the ground. At the same time , a bullet with the same mass in dropped from the same height. Neglecting air resistance, which one hits the ground first?Explain. ED posted Answer: Both will hit t...

What is twin paradox?

TWIN PARADOX is a paradoxical situation coming in while explaining the theory of relativity. “Time dilation” is one of the important consequences of relativity. It says that if a body is moving with relativistic speeds, time will dialate ...

A body is dropped from a tower of height 96 m. Another body is thrown up from the ground after a second with a velocity of 40 m/s.When and where they will meet?

A body is dropped from a tower of height 96 m. Another body is thrown up from the ground after a second with a velocity of 40 m/s. When and where they will meet? SOUNDARYA asked  Answer: For the first body, u=0 m/s Let S=x (from top) x=0.5 gt2  &#...